MDM Observatory 2.4m Telescope Observing Report for 2017 Jul 19

Observer(s): Hodges-Kluck, Kang, Cho
Institution(s): Michigan

Instrument: OSMOS/B

Worked for 7 hours (all night)
Conditions were Non-Photometric most of the night.
No equipment or software problems were encountered.

Seeing and Weather:
   Rain from 7pm until 9pm.
   Beg: Fog/Low Clouds, Winds Calm, Rain
   Mid: Seeing 1.3 arcsec, Clear, Winds Calm
   End: Seeing 1.4 arcsec, Clear, Winds Calm

Observing Summary:

The weather was mostly good tonight, after some thunderstorms in 
the afternoon and evening. The humidity was high, but did not 
cross the limit until around 4 am. Due to the strong afternoon
storms, we performed a lightning shutdown. Afterwards, hiltner
booted in 45 minutes, down from 90 last night, and we tried to
get as much water off the telescope as possible by slewing to
the north and then east.

During the clear period we observed about 12 targets and some 
standard fields, but the rising humidity prevented twilight 
flats or our plan for a standard spectrum, which we hope to get
tonight.

The only issue was that we had run out of dry nitrogen for
purging earlier in the day, and after the storms there was once
again a condensation ring that persisted all night. 

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Submitted on 2017 Jul 20 [5:10:40]